JPH04201626A - Lubricating device for differential gear device for vehicle - Google Patents

Abstract

PURPOSE:To carry out effective and reliable lubrication in a lubricating device of a vehicle going straight on by forming an oil inflow port at one edge part in the revolution axis center direction of a differential gear case and forming at least one oil effluence port directed to the tooth plane of a ring gear on the outer peripheral part in the revolution diameter direction, in a lubricating device for a differential gear device for a vehicle, etc. CONSTITUTION:At least one oil inflow port 30 directed toward the revolution axis center is formed at one side part 28 in the revolution axis center direction of a differential gear case 14, and at least one oil effluence port 36 directed toward the tooth plane 34 direction of a ring gear 12 is formed on the outer peripheral part 32 in the revolution diameter direction. With this constitution, the oil in the carrier space 6 of a differential gear carrier 4 is allowed to flow by the revolution of a drive pinion 10 and the ring gear 12, and flows into a case space 16 from the oil inflow port 30. The oil lubricates a differential gear pinion 18 and a side gear 20, and is discharged from the effluence port 36 by the revolution centrifugal force of the differential gear case 14.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a lubricating device for a differential device used in vehicles, industrial machinery, etc., and in particular, to achieve high lubrication and cooling effects, low cost, and light weight. This invention relates to a lubricating device for a differential device.

[Prior Art] A differential device is used in a vehicle such as an automobile in order to allow a change in rotational load from side to side, such as allowing a differential between left and right wheels during cornering.

The structure of a typical differential device is shown in the schematic cross-sectional view in Figure 1.

In FIG. 7, 102 represents a differential device, and 104 represents a differential carrier.

Rotation of a propulsion shaft (not shown) obtained from the vehicle engine is transmitted to the drive shaft 108, drive pinion 1101, ring gear 112, and differential case 114 disposed in the carrier space 106 of the differential carrier 104, and further to the differential case 114. A differential pinion 118 and a differential side gear 1 arranged in the case space 116 of
20 to the left and right drive wheel axles 122, driving the left and right wheels (not shown).

In addition, in the same figure, 124 is a drive shaft bearing,
126 is a differential case bearing.

Lubrication within the carrier space 106 of the differential carrier 104 is mainly caused by the drive pinion 1.
10, the oil is made to flow by stirring by rotation of a ring gear 112 or the like.

Further, lubrication of differential devices is disclosed in, for example, Japanese Utility Model Publication No. 58-4731, Japanese Utility Model Publication No. 63-8530, and Japanese Utility Model Application Publication No. 33-133410.

What is disclosed in Japanese Utility Model Publication No. 58-4731 is that an oil supply hole is provided in one of the front end wall and the rear end wall of the differential case of an interaxle differential, and an oil drain hole is provided in the other so as to communicate with the inside and outside of the differential case. , an oil supply passage having an outlet communicating with the oil supply hole is provided in the differential cover that covers the differential or the connection body of the cover, and a space between the space between the differential case and the differential cover and the outlet hole and the oil supply hole is provided. By installing an oil seal device that roughly seals the communication, it is intended to prevent deterioration of lubrication performance, which tends to run out due to centrifugal force due to the rotation of the interdifferential, and also to prevent deterioration of lubrication performance due to increased stirring resistance when the amount of oil is increased. It is. The oil catcher disclosed in Japanese Utility Model Publication No. 63-8530 has an oil catcher formed with an oil holding portion extending radially inward at a steep angle from one end of the cylindrical portion, and is fixed to the side surface of the differential cage, and the oil catcher is fixed to the side surface of the differential cage. By forming an oil supply hole in a portion close to the circumferential surface parallel to the rotation axis of the differential cage and facing the differential gear engagement surface and thrust washer,
The present invention aims to provide a lubricating device that can quickly lubricate the inside of an interaxle differential, which tends to be in short supply.

The device disclosed in Japanese Utility Model Application Publication No. 63-133410 is provided with a passage that is open at one end in the inner chamber of the differential case and extends radially outwardly with respect to the rotational axis of the differential case, and the other end of the passage is opened. The oil supply passage provided in the side gear shaft is communicated with the sliding contact portion of each component, and the oil supply passage provided in the side gear shaft is communicated with the inner chamber of the case.

[Problems to be Solved by the Invention] However, although the conventional lubrication system is effective in lubrication within the differential carrier, lubrication within the differential case is not necessarily carried out actively. In Figure 7, differential carrier 1
The oil injected into the carrier space 106 of 04 is agitated and flowed by the rotation of the drive pinion 110, ring gear 112, etc., and can actively lubricate the inside of the carrier space 108. However, since the oil flowing by the drive pinion 110, ring gear 112, etc. is difficult to flow into the case space 116- of the differential case 114, it is difficult to actively lubricate the differential pinion 118, etc. within the case space 116. There was an inconvenience that it was not possible.

In addition, the case space 1 of the differential case 114
16, when the differential pinion 118 and the differential side gear 120 rotate to perform differential operation in order to make the rotations of the left and right drive axles different when the vehicle turns, oil in the case space 116 is released. is stirred and fluidized. Therefore, it is conceivable to lubricate the inside of the differential case 114 by utilizing the rotation of the differential binion 118 and the like.

However, when the vehicle is traveling straight, there is no relative rotation of the differential binion 118 and the like as described above, so the oil is not stirred. For this reason, when the rotation of the differential binion 118 or the like is utilized, there is a problem that lubrication within the differential case 114 becomes insufficient.

[Object of the Invention] Therefore, the object of the present invention is to provide lubrication for the differential If, which eliminates the above-mentioned problems and allows oil to actively flow into the differential case to provide effective lubrication even when the vehicle is traveling straight. The purpose is to provide equipment.

[Means for Solving the Problems] In order to achieve this object, the lubricating device for a differential device according to the present invention includes at least one oil inlet at one end of the differential case in the direction of the rotation axis. The present invention is characterized in that at least one oil outlet is provided on the outer periphery of the differential case in the rotational diameter direction toward the tooth surface of the ring gear.

[Function] According to the configuration of the present invention, the oil flowing into the case space of the differential case from the oil inlet provided at one end in the rotational axis direction of the differential case flows into the differential case by rotation of the differential case. The oil flows out from an oil outlet provided on the outer periphery of the ring gear in the rotational diametrical direction toward the tooth surface of the ring gear. This allows oil to actively flow into the differential case, thereby lubricating the differential binion and differential side gears in the differential case even when the vehicle is traveling straight, and also lubricates the differential binion and differential side gear in the differential carrier. Pinion gear can be lubricated.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail and specifically based on the drawings.

1 to 3 show a first embodiment of the present invention.

In FIG. 1, 2 indicates a differential device, and 4 indicates a differential carrier.

The rotation of the propulsion shaft (not shown) of the vehicle driven by the engine (not shown) is caused by the differential carrier 4
The signal is transmitted to the drive shaft 8, drive pinion 10, ring gear 12, and differential case 14 arranged in the carrier space 6 of the differential case 1.
The signal is transmitted from a differential pinion 18 and a differential side gear 20 disposed in the case space 16 of No. 4 to the left and right drive wheel axles 22 to drive the left and right wheels (not shown).

In addition, in the same figure, 24 is a drive shaft bearing, 2
6 is a differential case bearing.

In such a differential device 2, the second @
As shown in FIG. 3, at least one oil inlet 30 is provided at one end 28 of the differential case 14 in the direction of the rotation axis, and the oil inlet 30 is provided in the one end 28 of the differential case 14 in the rotation axis direction. At least one oil outlet 36 is provided in the outer circumferential portion 32 toward the tooth surface 34 of the ring gear 12.

In addition, in the above-mentioned structure, the ring gear 12 is 1/3 inside the carrier space 6 of the differential carrier 4.
Lubricating oil is stored to the extent that it is completely submerged.

Next, the action will be explained.

When the propulsion shaft (not shown) rotates due to the driving force from the engine, the differential case 14 rotates.

At this time, the oil stored in the carrier space θ of the differential carrier 4 is flowed by the rotation of the drive pinion 10 and the ring gear 12, and flows into the case space 11 of the differential case 14 from the oil inlet 30.

The oil flowing into the case space 16 from the oil inlet 30 is transferred to the differential pinion 18 in the differential case 14 and the differential side gear 2 by the rotating differential case 14.
After the oil is lubricated and cooled, the oil is discharged from the outlet 36 toward the tooth surface 34 of the ring gear 12 due to the centrifugal force caused by the rotation of the differential case 14, and hits the drive pinion 10 and the ring gear 12, causing the oil to lubricate and cool. Promotes lubrication and cooling of mating parts.

That is, the oil inlet 3 is connected to the differential case 14.
By providing the 0 and oil outlet 36 as described above, it is possible to actively flow oil into the differential case 14 even when the vehicle is running straight and the differential binion 18 etc. are not rotating. can. Therefore, the lubrication and cooling ability of the differential pinion 18 and the differential side gear 20 in the differential case 14 can be improved, and the drive pinion 10 is also The lubrication and cooling ability of the meshing portion of the ring gear 12 and the ring gear 12 can be improved. As a result, gear wear can be reduced, misalignment can be avoided, gear noise can be prevented, and the durability of the gear can be improved.

Moreover, the formation of 30 and 36 each day is by casting,
Moreover, it can be manufactured by simple processing. For this reason,
In addition to being able to achieve the purpose at a low cost, there is no need for additional parts and the purpose can be achieved only by forming 30 and 36 each day, so the effect of weight reduction can also be obtained.

Next, a second embodiment based on the present invention will be described with reference to FIGS. 4 to 6.

Note that the structure of the differential device 2 used in FIGS. 4 to 6 of the second embodiment is the same as that of the first embodiment described above, so a detailed explanation will be omitted.

The feature of this second embodiment is that at least one oil inlet 30 is provided at one end 28 of the differential case 14 in the direction of the rotation axis, and the differential case 14 is provided with at least one oil inlet 30 in the direction of the rotation axis. A differential pinion 1 is pivotally supported on an outer peripheral portion 32 in the rotational diameter direction of the differential pinion 1.
8 is provided with at least one oil outlet 40 toward the tooth surface 34 of the ring gear 12.

According to the configuration of this second embodiment, the same effects as those of the first embodiment described above can be achieved. Furthermore, according to the second embodiment, by providing the oil outlet 40 on the shaft portion 38 of the differential pinion 18, further lubrication and cooling of the differential pinion 18 can be promoted.

Note that the positions and numbers of the oil inlet 30 and oil outlet 36Φ40 based on the present invention can be appropriately provided in addition to the above-mentioned embodiments, depending on the structure and required performance of the differential device 2. .

For example, it is effective to provide a large number of oil outflow ports 36 and 40 evenly around the circumference of the differential case 14.
They may be provided in both the differential case 14 and the differential pinion 18, respectively.

By providing a large number of oil inlets 30 uniformly with a large cross-sectional area within a range that does not affect the rigidity of the differential case 14, it is possible to supply a large amount of lubricating oil into the differential case 14, and it is also effective in reducing weight.

[Effects of the Invention] As explained above, according to the present invention, an oil-based differential pinion and It is possible to improve the lubrication and cooling performance of the differential side gear, and also to improve the lubrication and cooling performance of the meshing portion of the drive pinion and the ring gear.

That is, by providing an oil inlet and an oil outlet in the differential case, oil can be actively flowed into the differential case even when the vehicle is running straight and the differential pinion etc. are not rotating. . Therefore, it is possible to improve the lubrication and cooling ability of the differential pinion and differential side gear in the differential case, and the oil discharged from the oil outlet toward the tooth surface of the ring gear lubricates the meshing part of the drive pinion and ring gear. , the cooling capacity can be improved. Thereby, wear of the gear can be reduced, misalignment of meshing can be avoided, generation of gear noise can be prevented, and durability of the gear can be improved.

Furthermore, the oil inlet and oil outlet can be formed by casting or simple machining. Therefore, in addition to being able to achieve the purpose at low cost, the purpose can also be achieved by simply forming each day without requiring any additional parts, so it is possible to achieve the effect of weight reduction.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a schematic sectional view of a differential device, and FIGS. 2 and 3 are perspective views of a differential case, respectively. 4 to 6 show a second embodiment of the present invention, in which FIG. 4 is a schematic sectional view of the differential device, and FIGS. 5 and 6 are perspective views of the differential case, respectively. FIG. 7 is a schematic sectional view of a conventional differential device. In the figure, 2 is a differential device, 4 is a differential carrier, 6 is a carrier space, 10 is a drive pinion, 12 is a ring gear, 14 is a differential case, 16 is a case space, 18 is a differential pinion, 20 is a differential side gear, and 22 is a drive The wheel axle, 28 is one end, 30 is an oil inlet, 32 is an outer circumference, 36 is an oil outlet, and 40 is an oil outlet. Patent Applicant: Suzuki Co., Ltd. Agent, Patent Attorney, Yoshi Saigo, Figure 2, Figure 3, Procedure Juho Seisho (Method), February 13, 1991, 1, Case Indication Patent Application Plaintiff 2-333786 No. 2, Title of invention: Lubricating device for differential device 3, Relationship to the case of the person making the amendment Patent applicant address: 300 Takatsuka, Kamimura, Hamana-gun, Shizuoka Prefecture Name (2)
08) Suzuki Motor Corporation Representative Osamu Suzuki 4, Agent Address: 101 03-3292-
4411 (Representative) Address: 2-8-5 Kanda Ogawamachi, Chiyoda-ku, Tokyo Date of amendment order Voluntary
゛Ninini 6, Subject of amendment (1) Drawing 7, Contents of amendment (1) Submit official drawings.

Claims (1)

[Claims] 1. At least one oil inlet is provided at one end of the differential case in the direction of the rotational axis, and at least one oil outlet is provided at the outer periphery of the differential case in the rotational diameter direction toward the tooth surface of the ring gear. A lubricating device for a differential device, characterized in that: